Credit: Charles Dharapak/PA Wire/Press Association Images

From one royal couple to another!

President Barack Obama and First Lady Michelle Obama touched down in London on Monday -- and, on Tuesday, met with the brand-new Duke and Duchess of Cambridge!

Days after arriving home from their ten-day honeymoon in the Seychelles, Prince William, 28, and Kate, 29, happily greeted Barack, 49, and Michelle, 47, in Buckingham Palace.

PHOTOS: Check out PopSugar's gallery of Will and Kate meeting Barack and Michelle!

Britain's royal couple were sporting golden tans, naturally, from their luxurious private-island retreat off the east coast of Africa, where they went scuba diving, hung out on the beach and enjoyed a private butler among many other amenities. Chatting with the First Lady, Duchess Kate particularly glowed in a tan, form-fitting dress by Reiss Shola which retails for $340.

Upon their first arrival at the Palace late Monday, the Obamas were greeted by Queen Elizabeth II and Prince Phillip, who gave them a private tour of the premises. In a rare honor, the President and First Lady were then given a 41-gun salute by Scots Guards in red jackets, who also played the Star-Spangled Banner. A longer 61-gun salute at the Tower of London was also heard throughout the city.

America's first couple will reside for two nights a six-room suite -- last used by William and Kate on their wedding night.